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NBS TECHNICAL PUBLICATIONS

PERIODICALS

JOURNAL OF RESEARCH-The Journal of Research of the National Bureau of Standards reports NBS research and developnent in those disciplines of the physical and engineering sciences in which the Bureau is active. These include physics, chemistry, ngineering, mathematics, and computer sciences. Papers cover a road range of subjects, with major emphasis on measurement methodology and the basic technology underlying standardization. Also included from time to time are survey articles on topics losely related to the Bureau's technical and scientific programs. As a special service to subscribers each issue contains complete itations to all recent Bureau publications in both NBS and nonNBS media. Issued six times a year. Annual subscription: domestic 17; foreign $21.25. Single copy, $3 domestic; $3.75 foreign. NOTE: The Journal was formerly published in two sections: Secon A "Physics and Chemistry" and Section B "Mathematical ciences."

DIMENSIONS/NBS-This monthly magazine is published to inorm scientists, engineers, business and industry leaders, teachers, tudents, and consumers of the latest advances in science and echnology, with primary emphasis on work at NBS. The magazine ighlights and reviews such issues as energy research, fire protecion, building technology, metric conversion, pollution abatement, ealth and safety, and consumer product performance. In addiion, it reports the results of Bureau programs in measurement tandards and techniques, properties of matter and materials, ngineering standards and services, instrumentation, and utomatic data processing. Annual subscription: domestic $11; oreign $13.75.

NONPERIODICALS

-1onographs-Major contributions to the technical literature on arious subjects related to the Bureau's scientific and technical acivities.

Handbooks-Recommended codes of engineering and industrial practice (including safety codes) developed in cooperation with inerested industries, professional organizations, and regulatory odies.

Special Publications-Include proceedings of conferences sponored by NBS, NBS annual reports, and other special publications ppropriate to this grouping such as wall charts, pocket cards, and ibliographies.

Applied Mathematics Series-Mathematical tables, manuals, and tudies of special interest to physicists, engineers, chemists, biologists, mathematicians, computer programmers, and others ngaged in scientific and technical work.

National Standard Reference Data Series-Provides quantitative lata on the physical and chemical properties of materials, compiled from the world's literature and critically evaluated. Developed under a worldwide program coordinated by NBS under he authority of the National Standard Data Act (Public Law -0-396).

NOTE: The principal publication outlet for the foregoing data is the Journal of Physical and Chemical Reference Data (JPCRD) published quarterly for NBS by the American Chemical Society (ACS) and the American Institute of Physics (AIP). Subscriptions, reprints, and supplements available from ACS, 1155 Sixteenth St., NW, Washington, DC 20056.

Building Science Series-Disseminates technical information developed at the Bureau on building materials, components, systems, and whole structures. The series presents research results, test methods, and performance criteria related to the structural and environmental functions and the durability and safety characteristics of building elements and systems.

Technical Notes-Studies or reports which are complete in themselves but restrictive in their treatment of a subject. Analogous to monographs but not so comprehensive in scope or definitive in treatment of the subject area. Often serve as a vehicle for final reports of work performed at NBS under the sponsorship of other government agencies.

Voluntary Product Standards-Developed under procedures published by the Department of Commerce in Part 10, Title 15, of the Code of Federal Regulations. The standards establish nationally recognized requirements for products, and provide all concerned interests with a basis for common understanding of the characteristics of the products. NBS administers this program as a supplement to the activities of the private sector standardizing organizations.

Consumer Information Series-Practical information, based on NBS research and experience, covering areas of interest to the consumer. Easily understandable language and illustrations provide useful background knowledge for shopping in today's technological marketplace.

Order the above NBS publications from: Superintendent of Documents, Government Printing Office, Washington, DC 20402. Order the following NBS publications-FIPS and NBSIR's-from the National Technical Information Services, Springfield, VA 22161. Federal Information Processing Standards Publications (FIPS PUB)-Publications in this series collectively constitute the Federal Information Processing Standards Register. The Register serves as the official source of information in the Federal Government regarding standards issued by NBS pursuant to the Federal Property and Administrative Services Act of 1949 as amended, Public Law 89-306 (79 Stat. 1127), and as implemented by Executive Order 11717 (38 FR 12315, dated May 11, 1973) and Part 6 of Title 15 CFR (Code of Federal Regulations).

NBS Interagency Reports (NBSIR)-A special series of interim or final reports on work performed by NBS for outside sponsors (both government and non-government). In general, initial distribution is handled by the sponsor; public distribution is by the National Technical Information Services, Springfield, VA 22161, in paper copy or microfiche form.

BIBLIOGRAPHIC SUBSCRIPTION SERVICES

The following current-awareness and literature-survey bibliographies re issued periodically by the Bureau:

Cryogenic Data Center Current Awareness Service. A literature surey issued biweekly. Annual subscription: domestic $25; foreign 30.

Liquefied Natural Gas. A literature survey issued quarterly. Annual ubscription: $20.

Superconducting Devices and Materials. A literature survey issued quarterly. Annual subscription: $30. Please send subscription orders and remittances for the preceding bibliographic services to the National Bureau of Standards, Cryogenic Data Center (736) Boulder, CO 80303.

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The Journal of Research of the National Bureau of Standards reports NBS research and development in those disciplines of the physical and engineering sciences in which the Bureau is active. These include physics, chemistry, engineering, mathematics, and computer sciences. Papers cover a broad range of subjects, with major emphasis on measurement methodology, and the basic technology underlying standardization. Also included from time to time are survey articles on topics closely related to the Bureau's technical and scientific programs. As a special service to subscribers each issue contains complete citations to all recent NBS publications in NBS and non-NBS media. Issued six times a year. Annual subscription: domestic $17.00; foreign $21.25. Single copy, $3.00 domestic; $3.75 foreign.

Note: The Journal was formerly published in two sections: Section A "Physics and Chemistry" and Section B "Mathematical Sciences."

NATIONAL BUREAU OF STANDARDS

The National Bureau of Standards was established by an act of Congress on March 3, 190! The Bureau's overall goal is to strengthen and advance the Nation's science and technology and facilitate their effective application for public benefit. To this end, the Bureau conducts research and provides: (1) a basis for the Nation's physical measurement system, (2) scientific and technological services for industry and government, (3) a technical basis for equity in trade, and (4) technical services to promote public safety. The Bureau's technical work is performed by the National Measurement Laboratory, the National Engineering Laboratory, and the Institute for Computer Sciences and Technology.

THE NATIONAL MEASUREMENT LABORATORY provides the national system of physical and chemical and materials measurement; coordinates the system with measurement systems of other nations and furnishes essential services leading to accurate and uniform physical and chemical measurement throughout the Nation's scientific community, industry, and commerce, conducts materials research leading to improved methods of measurement standards, and data on the properties of materials needed by industry, commerce, educational institutions, and Government, provides advisory and research services to other Government agencies; develops, produces, and distributes Standard Reference Materials; and provides calibration services. The Laboratory consists of the following centers:

Absolute Physical Quantities - Radiation Research - Thermodynamics and Molecular Science - Analytical Chemistry - Materials Science.

THE NATIONAL ENGINEERING LABORATORY provides technology and technical services to the public and private sectors to address national needs and to solve nationa. problems, conducts research in engineering and applied science in support of these efforts builds and maintains competence in the necessary disciplines required to carry out this research and technical service, develops engineering data and measurement capabilities, provides engineering measurement traceability services, develops test methods and proposes engineering standards and code changes, develops and proposes new engineering practices and develops and improves mechanisms to transfer results of its research to the ultimate user The I aboratory consists of the following centers:

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THE INSTITUTE FOR COMPUTER SCIENCES AND TECHNOLOGY conducts research and provides scientific and technical services to aid Federal agencies in the selection acquisition, application, and use of computer technology to improve effectiveness and economy in Government operations in accordance with Public Law 89-306 (40 LSC 759) relevant Executive Orders, and other directives; carries out this mission by managing the Federal Information Processing Standards Program, developing Federal ADP standard's guidelines, and managing Federal participation in ADP voluntary standardization activities provides scientific and technological advisory services and assistance to Federal agencies, and provides the technical foundation for computer-related policies of the Federal Government The Institute consists of the following centers:

Programming Science and Technology - Computer Systems Engineering.

Headquarters and I aboratories at Gaithersburg, MD, unless otherwise noted, mailing address Washington, DC 20234

Some divisions within the center are located at Boulder, CO 80303

U.S. DEPARTMENT OF COMMERCE Philip M. Klutznick, Secretary NATIONAL BUREAU OF STANDARDS Ernest Ambler, Director

Order all publications from the Superintendent of Documents U.S. Government Printing Office, Washington, D.C. 20402 The Secretary of Commerce has determined that the publication of this periodical is necessary in the transaction of the public business required by law of this Department. Use of funds for printing this periodical has been approved by the Director of the Office of Management and Budget through June 30, 1981.

JOURNAL OF RESEARCH of the National Bureau of Standards
Vol. 85, No. 2, March-April 1980

Contents

Pseudo-Oxocarbons. Synthesis of 2, 1, 3-Bis-, and 1, 2, 3-Tris (Dicyanomethylene)
Croconate Slats. New Bond-Delocalized Dianions, "Croconate Violte" and
"Croconate Blue."

New-Bond-Delocalized Dianions: The Crystal Structure of 1, 3-Bis (dicyanomethylene)
Croconate Salt. (C,,N ̧O2K2· 2H2O). Vicky L. Himes, Alan G. Mighell, Camden R.
Hubbard, and Alexander J. Fatiadi

Radial Distribution Studies Under Highly Constrained Conditions. Ronald G. Munro. . . .

High Temperature Elastic Constants and the Evaluation of Effective Pair Potentials.
Raymond D. Mountain and Donald G. Knauss

Publications of the National Bureau of Standards . . .

Library of Congress Catalog Card Number: 63-37059

For sale by the Superintendent of Documents, U.S. Government Printing Office.
Washington, D.C. 20402. Order by SD Catalog

No. C13.22/vol. 85(2). Single copy price $3.00 Domestic; $3.75 Foreign.
Subscription price: $17.00 a year; $4.25 additional for foreign mailing.

UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON: 1980

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